| 中温固体氧化物燃料电池阴极Sr3Fe2-xNixO7-δ(x=0,0.1,0.2,0.3)的制备与性能 |
| Preparation and Performance of Sr3Fe2-xNixO7-δ (x=0, 0.1, 0.2, 0.3) Cathode for Intermediate-Temperature Solid Oxide Fuel Cells |
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| 摘要: 采用溶胶凝胶法（sol-gel）合成了Sr3Fe2-xNixO7-δ（x=0，0.1，0.2，0.3）系列阴极材料，通过X射线衍射、热膨胀系数测试、电导率测试、极化阻抗（Rp）测试、单电池性能测试等对材料的物相结构、热力学性能、电化学性能进行了表征。结果表明，所有样品均成功合成为具有类钙钛矿结构的单一纯相。热膨胀系数随着Ni元素掺杂含量的提高而不断下降。其高温电导率随着Ni元素掺杂含量的提高而升高，SFN30具有该系列最高的电导率101 S·cm-1。该系列样品的极化阻抗随着Ni元素掺杂含量的提高呈现先下降后上升的趋势，SFN10在800℃具有小的极化阻抗（Rp=0.078 8 Ω·cm2）。电解质支撑的单电池输出功率变化趋势与极化阻抗趋势一致，SFN10在800℃获得421.6 mW·cm-2的输出功率密度。 |
| 关键词: Sr3Fe2-xNixO7-δ 类钙钛矿结构 中温固体氧化物燃料电池 阴极材料 |
| 基金项目: 天津市教委科研计划（No.2018KJ254）和中央高校基本科研业务费（No.3122017083）资助项目。 |
| Abstract: Sr3Fe2-xNixO7-δ (x=0, 0.1, 0.2, 0.3) were synthesized by a modified complexing sol-gel process as cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The phase structure, thermodynamic properties and electrochemical properties of the materials were characterized by X-ray diffraction, thermal expansion coefficient test, conductivity test, polarization impedance (Rp) test and single cell performance test. The results showed that all samples were successfully synthesized with perovskite-like structure. The Sr3Fe2-xNixO7-δ cathode exhibited good chemical compatibility with the Ce0.8Sm0.2O1.9 (SDC) electrolyte at 1 000℃ for 5 h. The coefficient of thermal expansion (TEC) decreased with the increase of x, and the minimum value was 1.839×10-5 K-1. Its high temperature conductivity increased with the increase of Ni doping content, and SFN30 had the highest conductivity of 101 S·cm-1. The Rp of this series of samples showed a trend of decrease first and then increase with the increase of the doping content of Ni. SFN10 had the lowest polarization impedance of 0.078 8 Ω·cm2 at 800℃. The trend of the output power of the electrolyte-supported cell was consistent with the trend of polarization impedance. The SFN10 achieved an output power density of 421.6 mW·cm-2 at 800℃. |
| Keywords: Sr3Fe2-xNixO7-δ perovskite-like structure intermediate temperature solid oxide fuel cells cathode material |
| 投稿时间：2019-01-10 修订日期：2019-03-28 |
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| 赵忱,张婷,和永,曲亮武,周青军.中温固体氧化物燃料电池阴极Sr3Fe2-xNixO7-δ(x=0,0.1,0.2,0.3)的制备与性能[J].无机化学学报,2019,35(6):1027-1033. |
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